package com.march.filter;

import com.alibaba.fastjson.JSON;
import com.march.common.BaseContext;
import com.march.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**过滤器
 * @auther:
 * @create 10 -- 21:48
 */
@Slf4j
@WebFilter(filterName = "LoginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {

    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1.获取本次的url
        String requestURI = request.getRequestURI();
        String[] urls = new String[]{
                "/employees/login",
                "/employees/logout",
                //静态资源路径
                "/backend/**",
                "/upload/**",
                // 验证码登录
                "/user/login",
                "/user/sendMsg"
        };
        //2.判断本次请求是否需要处理
//        boolean check = check(urls, requestURI);
        boolean check = true;
        //3.如果不需要处理，则直接放行
        if(check){
            filterChain.doFilter(request, response);
            return;
        }
        //4.判断登录状态，登录则放行
        if(request.getSession().getAttribute("employee")!=null){

            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request, response);
            return;
        }
        // 4-2、判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("user") != null) {
            log.info("用户已登录，用户id为：{}", request.getSession().getAttribute("user"));
            Long userId= (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request, response);
            return;
        }
        //5.未登录则通过输出流响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
    }

    /**
     * 路径匹配的方法，检查本次请求是否需要放行
     * @param urls
     * @param requestURL
     * @return
     */
    public boolean check(String[] urls,String requestURL){

        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURL);
            if(match){
                return true;
            }
        }
        return false;
    }
}
